<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button v-on:click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside v-bind:width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" v-on:click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409fff"
          v-bind:unique-opened="true"
          v-bind:collapse="isCollapse"
          v-bind:collapse-transition="false"
          router
          v-bind:default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu
            v-bind:index="item.id + ''"
            v-for="item in menulist"
            v-bind:key="item.id"
          >
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 一级菜单图标 -->
              <i v-bind:class="iconsObj[item.id]"></i>

              <!-- 一级菜单文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              v-bind:index="'/' + subItem.path + ''"
              v-for="subItem in item.children"
              v-bind:key="subItem.id"
              v-on:click="saveNavState('/' + subItem.path)"
            >
              <!-- 二级菜单的模板区域 -->
              <template slot="title">
                <!-- 二级菜单图标 -->
                <i class="el-icon-menu"></i>
                <!-- 二级菜单文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体区域 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      iconsObj: {
        125: "iconfont icon-user",
        103: "iconfont icon-tijikongjian",
        101: "iconfont icon-shangpin",
        102: "iconfont icon-danju",
        145: "iconfont icon-baobiao",
      },
      // 控制左侧菜单折叠与展开按钮
      isCollapse: false, // false 默认不折叠
      // 被点击的菜单栏地址
      activePath: "",
    };
  },
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem("index");
  },
  methods: {
    logout: function () {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    // 获取所有菜单
    async getMenuList() {
      const { data: res } = await this.$http.get("menus");
      if (res.meta.status !== 200)
        return this.$message.console.error(res.meta.msg);
      this.menulist = res.data;
    },
    // 点击按钮，切换左侧菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活高亮状态
    saveNavState(index) {
      window.sessionStorage.setItem("index", index);
      this.activePath = index;
    },
  },
};
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  background-color: #373d41;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
}
.el-menu {
  border-right: none;
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em; // 这个样式是让三根竖线间隔一定距离
  cursor: pointer; // 鼠标移动过去变成小手
}
</style>
